BIO1011 Lecture Notes - Lecture 1: Hydrogen Atom, Manganese, Cell Nucleus

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Elements of this hierarchy can be viewed from multiple different perspectives. Just 4 make up 99% of the mass of most cells. Oxygen, silicon, aluminium iron = earth"s crust. Hydrogen, helium, carbon, nitrogen, oxygen = the universe. Major elements: h - hydrogen, o oxygen, c - carbon, n - nitrogen. Minor elements: p - phosphorus, s - sulphur, ca calcium, na - sodium, k - potassium. All form covalent bonds by electron sharing with each other. Covale(cid:374)t (cid:271)o(cid:374)ds = (cid:862) tro(cid:374)g(cid:863) (cid:271)o(cid:374)ds: consist of a shared pair of electrons to fill the outer orbit. Single covalent bond = 1 pair of shared electrons. Double covalent bond = 2 pairs of shared electrons. H, o, c and n are the lightest elements capable of forming covalent bonds. Triple covalent bond = 3 pairs of shared electrons. The strength of a covalent bond is inversely proportional to atomic weight. (also bond strength increases with bond order)

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